Patent GB-606122-A (GB)
Title: Improvements in or relating to photographic justifying apparatus
IPC: B41B13/04
Filed: 1945-07-16
Abstract: 606,122. Photo-electric control of printing machines. INTERNATIONAL BUSINESS MACHINES CORPORATION. July 16, 1945, No..18106. Convention date, Oct. 27, 1944. [Class 40 (iii)] [Also in Group XX] Apparatus for photographically reproducing typewritten copy line-byline in justified form includes a copy-holder for moving each line of the copy into photographing position, a camera for photographing the lines of copy in succession on a light-sensitive surface, lens means between the camera and copy-holder movable along a path extending transverse to the optical axis and so constructed that as it moves the length only of the line in photographing position is varied as it appears to the camera, and photo-electric means cooperating with a control dot placed at a fixed distance from the end of each line to open the camera shutter when the lens means is positioned to reproduce the line to the correct length. As shown, the apparatus comprises the copy-holder 10, the camera 12, and the lens means 13. The copy is prepared on a typewriter with the lines having a common lefthand margin and having a variation in the right-hand margin not exceeding five letter spaces. A black control spot is placed by the operation of a special key at a fixed distance from the last character in the line, deliberately short lines not requiring justification having the spot in the position for maximum length lines. The copy sheet 11 is held on the roller 26 by rollers 28, 29 and is fed by pawl-and-ratchet mechanism 30a, 31a under control of the solenoid 32. The film 35 in the camera is similarly fed from spool 36 to spool 37. A mask opening 40 confines the area of film exposed to that just sufficient for photographing a line at the predetermined justified length. The lens means 13 comprises six transparent elements 13a-13f in a holder 50 carried by bell-crank 52, the other end of which carries a roller 55 engaging a cam 56 having high and low cylindrical dwell portions 56a and 56f and four pairs of intermediate cylindrical dwell portions 56b-56e. Engagement of the roller 55 with the appropriate dwell portion positions the corresponding element 13a-f across the optical axis A. The element 13a is parallelsided and is used with lines of correct length. The elements 13b-f are formed as cylindrical lenses arranged so that the left-hand margin of all lines is not displaced, but of progressively increasing curvature to bring lines of one, two, three, four and five spaces short respectively to the correct length when copied. The control spot co-operates with the light-sensitive cell 60 provided with collimator 61 to open the camera shutter by means of relay 62 and solenoid 44 when the spot stops passage of light to cell 60 and thus effects exposure with the correct element 13a-f in the optical axis. Current also passes through solenoids 32 and 49 to feed both the copy and the film by one line space. In a modification, the lens element 13 is replaced by one transparent element of which one-half is formed as a rectangular glass prism and the other a cylindrical lens of curvature corresponding to that of 13f.